SUM OF ALL INTERIOR ANGLES IN A POLYGON IS (n- 2)180 degree

In this video I have explained how to prove that the sum of interior angles in a polygon . This topic is useful in geometry. This important theorem of class 8 and 9 in cbse board icse board up board. ~-~~-~~~-~~-~ Please watch: "Q. 1 EX 2.2 NCERT CLASS 12 INVERSE TRIGONOMETRIC FUNCTIONS" https://www.seevid.ir/fa/w/_Wi8LPne3Fw ~-~~-~~~-~~-~

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